Browsing by Author "Venette, Robert C"
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Item Data and code for forecasting overwintering mortality of Spathius galinae in North America(2021-04-26) Wittman, Jacob T; Aukema, Brian H; Duan, Jian J; Venette, Robert C; wittm094@@umn.edu; Wittman, Jacob TFrom publication: Evaluating the cold tolerance of biological control agents is often necessary to optimize their release and performance. We used field and laboratory assays to determine the cold hardiness of the parasitoid Spathius galinae Belokobylskij & Strazanac, an approved classical biological control agent of emerald ash borer (Agrilus planipennis Fairmaire) in North America. Supercooling points and lower lethal temperature of mature (cocooned) S. galinae larvae were measured in controlled cooling assays in the laboratory. Most S. galinae larvae died after reaching their supercooling point, which occurred at -25.0°C on average. Several larvae, however, initiated freezing but later eclosed, suggesting S. galinae may be partially freeze tolerant. Supercooling points were not affected by chilling rate. In the winter of 2019 – 2020, we monitored development of mature S. galinae larvae in ash segments above and beneath the snow in three locations in Minnesota, USA. Nearly 100% of S. galinae larvae died after air temperatures reached -29°C in Minnesota. Using models developed from our data, we forecast eclosion rates of S. galinae based on minimum winter temperatures across the range of ash (Fraxinus spp.) in North America. Our results indicate that S. galinae populations may suffer high overwintering mortality in areas where winter temperatures regularly decrease below -28°C, but a small portion of the population may be able to survive lower temperatures.Item Data for: Allopatric populations of the invasive larch casebearer differ in cold tolerance and phenology(2019-05-13) Ward, Samuel F; Eidson, Erika L; Kees, Aubree M; Venette, Robert C; Aukema, Brian H; ward225@purdue.edu; Ward, Samuel FItem Data from: Development of an aggressive bark beetle on novel hosts: Implications for outbreaks in an invaded range(2017-11-11) Rosenberger, Derek W; Venette, Robert C; Aukema, Brian H; dwrosenberger@olivet.edu; Rosenberger, Derek WMountain pine beetle (Dendroctonus ponderosae Hopkins) is an aggressive bark beetle native to western North America currently expanding its range east. Should it reach northeastern North American pine forests, it is unclear how novel pine hosts might affect traits related to reproduction and development. These data are the result of studies meant to determine how four novel pine hosts might impact mountain pine beetle reproduction and development, relative to two historical hosts.Item Mountain Pine Beetle Colonization of Novel Hosts(2017-04-20) Rosenberger, Derek W; Venette, Robert C; Maddox, Mitchell P; Aukema, Brian H; dwrosenberger@olivet.edu; Rosenberger, Derek WMountain pine beetle (Dendroctonus ponderosae) threatens eastern pine species due to an ongoing eastward expansion of its range through the Canadian boreal forest. This data was collected to assess the acceptance and attraction behaviors of mountain pine beetle in relation to two historical western North American and four novel eastern North American hosts.Item Supplementary Materials for the article: A participatory method for prioritizing invasive species: Ranking threats to Minnesota’s terrestrial ecosystems(2021-01-08) Morey, Amy C; Venette, Robert C; morey041@umn.edu; Morey, Amy, C; Minnesota Terrestrial Invasive Plants and Pests Center (University of Minnesota)The data and data summaries here support the work being published in the article, "A participatory method for prioritizing invasive species: ranking threats to Minnesota’s terrestrial ecosystems" in the Journal of Environmental Management.